the amount of the money for the service than before.用is more

答案为：is larger
the amount of 是指数量 ,比如The amount of the students is 100.
a large amount of指很多 （很大数量）
A large amount of students are playing games together.
本句主语为the amount,意为钱的数额大,故应用is large

is more

is more :

The number of students is 100, 不是 " the amount of students is 100"
" A large amount of students are playing games together " , 应是 " A large number of students are playing games together "
A large amount of water : 大量的水因为水不能一个一个算